Scribing compass or divider



Dec. 19, 1967 F. H. LIESONG, SR 3,358,371

SCRIBING COMPASS OR DIVIDER Filed Dec. 7, 1966 INVVENTOZ F250 H.L/Efazv; 5':

ATTOENEY United States Patent 3,358,371 SCRIBING COMPASS 0R DIVIDER FredH. Liesong, Sn, 12925 Tulane St., Brookfield, Wis. 53005 Filed Dec. 7,1966, Ser. No. 599,813 2 Claims. (Cl. 33-27) ABSTRACT OF THE DISCLOSUREA scribing compass or divider of the type used by pattern makersincluding a pair of legs provided with a pair of integral head portionspivoted together. Elongated extensions are pivoted to the free ends ofthe legs, and links connect the head portions and the extensions tomaintain the extensions in parallel relation during movement of thelegs, and a knob cam arrangement for a fine adjustment of one of saidextensions.

Background of the invention The prior art closest to the invention asknown to the applicant is the patent to Vlcek, No. 1,903,393. Thepresent invention has fewer parts and is an improvement for simplicity.

Description of the invention In the drawing:

FIG. 1 is a front elevation of a scribing compass or divider embodyingthe invention.

FIG. 2 is a side elevation thereof.

FIG. 3 is a top elevational view.

FIG. 4 is a fragmentary view in elevation partially broken away of thehead portions as in FIG. 1 taken from the rear side.

FIG. 5 is a cross-sectional view taken on line 55 of FIG. 1.

Referring more particularly to the drawing, the numeral refers to thedevice generally, having a pair of legs 11 and 12 with integral headportions 13 and 14 joined by the pivot member 15. Head portion 13 has anarcuate slot at 16 to accommodate movement therein of the bolt 17 whichis fixed in the head portion 14 and extends through the slot 16 andcarries knurled nut 18. The legs 10 and 11 carry the pivoted extensions19 and 20, each of which are provided with a scribing element 21releasably secured by the threaded means 22 or may be fitted with a penor pencil as desired.

The legs 10 and 11 are connected integrally with the head portions 13and 14 which latter are connected to the extensions 19 and 20 by meansof the links 23 and 24 pivoted at their lower ends to the opposedlateral elements 25 and 26.

The upper end of the link 23 is pivotally connected with the headportion 14. The upper end of the link 24 is similarly connected with apin 27 on cam 28 which is revoluble by the integral knurled knob 29whereby a fine adjustment of the extension 20 may be effected.

In use, when the knurled nut 18 is loose, the legs 11 and 12 may bemanually spread and set by tightening the nut 18. The extension 28 maythen be moved in a fine adjustment by manipulating the knurled knob 29,after which the device 10 may be employed in the usual manner.

It will be understood that the device is capable of many modificationsin structure and design, without departing from the spirit of theinvention, within the scope of the appended claims.

Having thus described the invention, what is claimed and desired to besecured by Letters Patent of the United States is:

1. A compass or divider including a pair of legs, integral circular headportions thereon, pivot means for pivotally mounting the head portionstogether, extensions pivotally mounted on said legs, link memberspivoted to and connecting the head portions and said extensions tomaintain parallel relation of said extensions during movement of thelegs, and a combination knob cam rotatably mounted in one head portion,an oiT-center pin on said cam connected with one link for fineadjustment of the extension associated therewith.

2. A device as in claim 1, and scribing means disposed in the free endsof said extensions.

References Cited UNITED STATES PATENTS FOREIGN PATENTS 851,82 10/199France.

HARRY N. HAROIAN, Primary Examiner.

1. A COMPASS OR DIVIDER INCLUDING A PAIR OF LEGS, INTEGRAL CIRCULAR HAEDPORTIONS THEREON, PIVOT MEANS FOR PIVOTALLY MOUNTING THE HEAD PORTIONSTOGETHER, EXTENSIONS PIVOTALLY MOUNTED ON SAID LEGS, LINK MEMBERSPIVOTED TO AND CONNECTING THE HEAD PORTIONS AND EXTENSIONS TO MAINTAINPARALLEL RELATION OF SAID EXTENSION DURING MOVEMENT OF THE LEGS, AND ACOMBINATION KNOB CAM ROTATABLY MOUNTED